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206.258.9754 <br />From: Jelena Vandenhaak <Jelena.Vandenhaak@ContechLLC.com> <br />Sent: Thursday, January 14, 2021 3:20 AM <br />To: Katie Herold <Katie.Herold@kpff.com> <br />Cc: Jordan Drugge <Jordan.Drugge@ContechLLC.com> <br />Subject: RE: Filterra Bioscape vault downstream of FC <br />Hello Katie <br />Sorry about not getting back to you sooner on this one. <br />Yes, I did talk to the product manager and he came up with the following answer. <br />"Ideally we recommend 24 hours pumping and then a 24 hour rest period. We recently did some testing on Filterra <br />media and confirmed that up to 48 hour drain down times were acceptable at 175"/hr. We would not recommend <br />longer than that without a resting period of 24 hours or so." <br />Since you are trying to achieve oil control, we would be sizing at SO"/hr, so his last comments is not really applicable. <br />Overall, the good news is that it would be possible, as the pumps eliminate some of the issues of downstream of <br />detention system. <br />But you would be limited to 24 hours pumping and a 24hr rest period, which I don't know if achievable for your project? <br />Hope this is helpful and please let us know if you wish forward or have any other questions <br />Thank you <br />Jelena <br />Jelena Vandenhaak, P.E.* <br />Stormwater Consultant, King County <br />CONTECH Engineered Solutions LLC <br />Seattle, WA <br />Mob: 206-730-7946 <br />avandenhaak@conteches.com <br />www.ContechES.com <br />*registered in AZ <br />From: Katie Herold <Katie.Herold@kpff.com> <br />Sent: Tuesday, January 12, 2021 3:24 PM <br />To: Vandenhaak, Jelena <JVandenhaak@conteches.com> <br />Subject: Filterra Bioscape vault downstream of FC <br />Jelena- Happy New Year. We spoke briefly during the holidays about the potential to put a Bioscape vault for oil control <br />and enhanced treatment downstream of detention. This scenario would have a pump that would be dedicated to the <br />low flow 2-year release rate and could be pumped up to the filter vault. <br />Have you had a chance internally to discuss whether Contech would approve this type of installation? <br />Thanks! <br />1Tff <br />Katie Herold, PE <br />Associate <br />M 206.258.9754 O 206.622.5822 <br />1601 5th Avenue, Suite 1600 <br />Seattle, WA 98101 <br />